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TEXT-BOOK OF PHYSIOLOGY. 



to the ovary. The tube consists of three coats an external or 

 serous; a middle or muscular, the fibers of which are arranged 

 longitudinally and transversely; and an internal or mucous. The 

 surface of the mucous coat is covered with a layer of ciliated epithelial 

 cells, the motion of which is toward the uterus. 



The Uterus. The uterus is pyriform in shape and divided into 

 a body and neck. It measures, before the first pregnancy, about 



7 cm. in length, 5 cm. 

 5 -. in breadth and 2j 

 cm. in thickness. A 

 frontal section of the 

 uterus shows a central 

 cavity which in the 

 body is triangular in 

 shape, in the neck 

 oval or fusiform (Fig. 

 320). At the upper 

 angles of the uterus 

 the cavity is contin- 

 uous with the cavity of 

 each Fallopian tube. 

 At the junction of the 

 body and the neck, 

 the cavity presents a 

 constriction, the inter- 

 nal os. The constric- 

 tion at the end of the 

 neck is known as the 

 external os. The 

 walls of the uterus 

 are extremely thick 

 and composed of non- 

 striated muscle-fibers 

 arranged in a very 

 complicated manner. 

 The interior of the 

 uterus is lined by 

 mucous membrane 

 covered with cylindric 



ciliated epithelial cells, the motion of which is toward the external 

 os. Tubular glands are found in large numbers in the mucous 

 membrane lining the cavity, while racemose glands are found in 

 the mucous membrane lining the neck. Owing to the flattening of 

 the uterus from before backward the walls are almost in contact 

 and the cavity almost obliterated. 



The Vagina. The vagina is a musculo-membranous canal, from 



FIG. 318. SECTION OF CORTEX OF CAT'S OVARY, 

 EXHIBITING LARGE GRAAFIAN FOLLICLES. a. 

 Peripheral zone of condensed stroma. b. Groups 

 of immature follicles, c. Theca of follicle, d. 

 Membrana granulosa. e. Discus proligerus. /. 

 Zona pellucida. g. Vitellus. h. Germinal vesi- 

 cle, i. Germinal spot. k. Cavity of liquor fol- 

 liculi. (After Piersol.} 



